News Details
Anti-corrosion passivation film coating with crosslinking agent
2017-3-26 20:31:04
Anti-corrosion passivation film coating with crosslinking agent,Passivation is a metal surface to form compact structure, and then the method to improve the corrosion resistance of metal. The formation of metal surface passivation layer can effectively internal organization corrosive substances into the metal, improve the corrosion protection performance of coating.
Waterborne polyurethane coating with excellent adhesion and flexibility, etc. But because of its low crosslinking density, water-based polyurethane coating comprehensive performance than solvent-based polyurethane (PU) is still a certain gap, so you need to use a certain method to modification of waterborne polyurethane coating, to improve the performance of waterborne polyurethane coating.
With waterborne polyurethane, TiSO4, such as Yang (NH2) 2 cs, NH4F as raw materials, blending after spraying in acetone processed on sheet metal, in turn in HNO3, deionized water, passivation solution, etc, are compounded anti-corrosion passivation film.
Waterborne polyurethane polymer molecules composed of mesh structure to ensure the film adhesion and strength; Inorganic corrosion inhibitors as filler filler in the film, and improve the corrosion resistance performance of the film. Test results show that the thickness of the film is only 0.5 mu m, and excellent corrosion resistance.
Huang first with DS - 250, such as poly (caprolactone diol, 4, 4 - methylene ring has based isocyanate (MCI) as raw material to the preparation of polyurethane prepolymer, then waterborne trimer with amine closure period of aniline (ACAT) reaction to get electroactive water-borne polyurethane (EWPU).
Through in 3.5% nacl electrolyte solution of a series of performance test, electrochemical corrosion EWPU coating shows excellent corrosion resistance, SEM and XPS results show that the EWPU CRS electrode with its REDOX catalytic properties in the density of metal surface to form the passivation layer, make it has better corrosion resistance.
Waterborne polyurethane is the main purpose of the development of fiber or leather treatment agent. As the ceaseless improvement of performance, polyurethane crosslinking agent price, range of application is becoming more and more widely. USES include coating, adhesive (glue), treatment agent, emulsion polymerization, polymer emulsifier and so on.
Using phenol, methyl ethyl ketone and amine, pyrrolidone, sodium bisulfite, such as blocking agent, with the hydrophilic ionic groups and - NCO sealing side of polyurethane prepolymer end - NCO groups protected, lose - NCO group activity, make a kind of enclosed type polyurethane pre polymers, joined the chain extension agent and crosslinking agent together after emulsification, waterborne polyurethane dispersion.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
Heating applications, can make the prepolymer end - NCO group unsealed, polyurethane crosslinker, - NCO group chain extension agent, crosslinking agent and reaction, form the network structure of the polyurethane film. The method of high technical requirements and emulsion stability, the key is to choose low deblocking temperature of blocking agent.
Water-based polyurethane anticorrosion coating made great progress. But the traditional solvent coating still dominate the market, waterborne polyurethane anticorrosion coating to the further development of still need to solve the following questions:
(1) the water resistance of waterborne polyurethane. Waterborne polyurethane hydrophilic group, leading to less than a solvent-based coating, the density of the coating and coating of poor water resistance; The water resistance of waterborne polyurethane coating and wettability are both problems to be solved.
(2) the coating process and coating conditions. Clean degree of impact on the performance of coating on the surface of the substrate and the coating effect; To optimize the coating process, and improve the construction efficiency is the premise of water-based polyurethane anticorrosion coating promotion.
(3) the cost of production. Water-based polyurethane anticorrosion coating raw material price is high, the production process requirement is high, hindered the further development of the industrialization and marketization. The future development trend of waterborne polyurethane anticorrosion coating is on the basis of the guarantee its excellent anti-corrosion performance, reduce cost, simplify the process, promoting the development of industrialization.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Waterborne polyurethane coating with excellent adhesion and flexibility, etc. But because of its low crosslinking density, water-based polyurethane coating comprehensive performance than solvent-based polyurethane (PU) is still a certain gap, so you need to use a certain method to modification of waterborne polyurethane coating, to improve the performance of waterborne polyurethane coating.
With waterborne polyurethane, TiSO4, such as Yang (NH2) 2 cs, NH4F as raw materials, blending after spraying in acetone processed on sheet metal, in turn in HNO3, deionized water, passivation solution, etc, are compounded anti-corrosion passivation film.
Waterborne polyurethane polymer molecules composed of mesh structure to ensure the film adhesion and strength; Inorganic corrosion inhibitors as filler filler in the film, and improve the corrosion resistance performance of the film. Test results show that the thickness of the film is only 0.5 mu m, and excellent corrosion resistance.
Huang first with DS - 250, such as poly (caprolactone diol, 4, 4 - methylene ring has based isocyanate (MCI) as raw material to the preparation of polyurethane prepolymer, then waterborne trimer with amine closure period of aniline (ACAT) reaction to get electroactive water-borne polyurethane (EWPU).
Through in 3.5% nacl electrolyte solution of a series of performance test, electrochemical corrosion EWPU coating shows excellent corrosion resistance, SEM and XPS results show that the EWPU CRS electrode with its REDOX catalytic properties in the density of metal surface to form the passivation layer, make it has better corrosion resistance.
Waterborne polyurethane is the main purpose of the development of fiber or leather treatment agent. As the ceaseless improvement of performance, polyurethane crosslinking agent price, range of application is becoming more and more widely. USES include coating, adhesive (glue), treatment agent, emulsion polymerization, polymer emulsifier and so on.
Using phenol, methyl ethyl ketone and amine, pyrrolidone, sodium bisulfite, such as blocking agent, with the hydrophilic ionic groups and - NCO sealing side of polyurethane prepolymer end - NCO groups protected, lose - NCO group activity, make a kind of enclosed type polyurethane pre polymers, joined the chain extension agent and crosslinking agent together after emulsification, waterborne polyurethane dispersion.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
Heating applications, can make the prepolymer end - NCO group unsealed, polyurethane crosslinker, - NCO group chain extension agent, crosslinking agent and reaction, form the network structure of the polyurethane film. The method of high technical requirements and emulsion stability, the key is to choose low deblocking temperature of blocking agent.
Water-based polyurethane anticorrosion coating made great progress. But the traditional solvent coating still dominate the market, waterborne polyurethane anticorrosion coating to the further development of still need to solve the following questions:
(1) the water resistance of waterborne polyurethane. Waterborne polyurethane hydrophilic group, leading to less than a solvent-based coating, the density of the coating and coating of poor water resistance; The water resistance of waterborne polyurethane coating and wettability are both problems to be solved.
(2) the coating process and coating conditions. Clean degree of impact on the performance of coating on the surface of the substrate and the coating effect; To optimize the coating process, and improve the construction efficiency is the premise of water-based polyurethane anticorrosion coating promotion.
(3) the cost of production. Water-based polyurethane anticorrosion coating raw material price is high, the production process requirement is high, hindered the further development of the industrialization and marketization. The future development trend of waterborne polyurethane anticorrosion coating is on the basis of the guarantee its excellent anti-corrosion performance, reduce cost, simplify the process, promoting the development of industrialization.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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